Forney 55652 Automatic Darkening Welding Helmet, Camouflage Helmet has a lightweight impact resistant nylon shell for durability Equipped with a geared headband mechanism that reduces the amount of head movement required to lower face shield Reduces head and neck strain and general fatigue caused by repeatedly lowering face shield Variable shade protection from DIN 9 to DIN 13 High performance power cells for switching time light to dark at 1/30,000 of a second